Steam-generator.



= Patented Nov. 2|, |899.

No. 637,628. J. R. mAcKAY.

STEAM GENERATOR.

(../Lpplica'tionJilgl Apr. 29, 1899.)

(No Model.)

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H'WWM UNITED STATES 'PATENT OFFICE.

JOHN RUSSELL MACKAY, OF NEW YORK, N. Y.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 637,628, dated November2l, 1899. Application tiled April 29, 1899. Serial No. 714,955. (Nomodel.)

To @ZZ whom it may concern:

Be it known that I, JOHN RUSSELL MACKAY, a citizen of the United States,residing at 452 Henry street, New York, (Brooklyn,) in the county ofKings and State of New York, have invented certain new and usefulImprovements in Steam-Generators; and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to whichit appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in steam-generators and tofeed-water heaters and like apparatus where heated gases traverse linesor tubes for heating water or for other purposes, and has for its objectto provide a flue or tube lining whereby a maximum amount of heat isintercepted from the gases before they are discharged.

The invention consists in the construction and employment of abaffle-liner within the tubes or lues through which the gases pass, suchbaffie-liner being formed from corrugated or other metal plate which isbent into circular form and fitted within the tube or flue, so that theexterior edges or faces of the corrugations or ribs of the plate shalllie in contact with the interior of the tube, while the body of theplate shall form longitudinal chambers through which the gases pass,thus causing them to come in contact with a relatively large supercialarea, the maximum amount of heat being by this means intercepted andretained for augmenting the temperature of the water in the boiler orelsewhere.

Modifications of the invention are shown in which a plate having ribs orprojections is substituted for the corrugated plate, the function andoperation being practically the same, and also in which two plates areused instead of one.

My invention is illustrated in the accompanying drawings, which form apart of this application, in which- Figure l is a sectional view of aiiue having an inner Abaiiie-liner made according to my invention andrepresents a cross-section y on the line x cc of Fig. 2. Fig. 2 is alongituwith the design shown in Figs. l, 2, and 3 I '6o longitudinallybend or crimp a sheet of iron A or other suitable metal to form corruga;tions a, whose outer edges a' are su bstantially flat or but slightlycurved, so that when the plate is bent into circular or cylindrical formit shall fit and be pressed into closecontact with the interior of thetube or ue Z), in which it is inserted, while the edges a2 of the plateare of such proportions and so disposed as to leave narrow longitudinalinterstitial spaces c, through which the gases may pass to the spacespartially inclosed by the corrugated parts. At one end of the liner acap or plug D is provided, which closes the inner tubular space C, sothat thereby the gases are forced to pass from thesaid space through thenarrow spaces c to the longitudinal spaces c and thence to the outlet.

In carrying my invention into eect the ribs or projections may bediagonally formed, so as to be spirally disposed within the tube whenthe liner is inserted therein, or the ina ner tube may. be conicallyformed instead of cylindrical and a cap or plug introduced at one end ofconical form to tightly fit and press the liner in contact with theinterior of the tube or fine. l As shown in Figs. `Z and 8, thebaffle-liner may be produced from two plates H, arranged to form acentral space C, the arms h being providedwith flanges 71.', which lieagainst the inner face of the tube B. The plates Hlie one against theother upon their edges h2 or h3 h4, which are preferably inclined, sothat each of the plates of the lineris wedgefshaped, thereby permittingof one part being first introduced and the other being forced into itsproper position.

It is obvious that the baffle-liner may be formed from cast instead ofsheet metal. It

may be perforated to permit the passage of the gases from one side tothe other of any of the partitions, as may be found desirable.

Having thus described my invention, what IOO , dially from said centralchamber and commu nicating therewith, substantially as set forth. 3. Aliner for boiler-tubes composed of a sheet-metal plate `bentlongitudinally to form" a central chamber and to form openbranchescommunicating With said central chamber in combination with adeflector at the entrance to said liner, substantially as described.

4. A liner for boiler-tubes composed of aA sheet-metal plate bentlongitudinally to form Y a central chamber and to form branches eX-tending radially from said central chamber,

and a plug for closing one end of the central chamber, substantially asset forth.

5. Aliner yfor boiler-tubes composed of a sheet-metal plate bentlongitudinally to form a central chamber and to form open branchescommunicating with said central chamber, in combination with a deflectorat the entrance of Vsaid liner and a plug or closure for one end ofV thecentral chamber, Ysubstantially as set forth.

In testimony whereof I affix my signature 'in presence of two Witnesses.

JOHN

' Witnesses:`

FRANK CONNOR,

JAMES B. DUNLOP.

RUSSELL MACKAY.

